Originally Posted by
ROKNA
Two problems
1. Allowing transfer passengers from US/EEA to skip security, but these will most likely have to pass a passport check as they may exit via the CTA/Domestic or leave the terminal by other means
2. Allowing CTA passengers to reach baggage without a passport check without resorting to UK style messing with buses. This adds some fun as transfer passengers from the CTA won't go via the transfer desk, so EI would need a service desk in the T2 departures area
US passengers travelling to LHR don't undergo any additional passport check on arrival into the UK. They take the same bus at LGW. I have often overheard US accents expressing surprise at not being checked.